Cosmic Ray Variations of Magnetospheric and Atmospheric Origin in September 2017

From ground-based observations of cosmic rays (CR) at the global network of neutron monitors, Yakutsk suite of muon telescopes, and the URAGAN muon hodoscope (Moscow), through the modified method of the spectrographic global survey we investigated variations in CR of magnetospheric and atmospheric origin for September, 2017. We demonstrated the possibility to use the data on the unstable charged component of secondary CRs for the study of CR variations without the need to introduce corrections for temperature effect. Obtained were temporal variations in the planetary system of the CR rigidities of geomagnetic cutoff (RGC) and in the mass average air temperature at the points of observation of the charged components. Based on the data on the RGC planetary system variations within the axisymmetric model for the Earth bounded magnetosphere, we calculated the parameters for some magnetospheric current systems during the 2017 September geomagnetic disturbances.